Depending on what shape it's in and how stable it is. Table tennis tables
don't usually have a lot of support so when you are cutting in the middle
you might get a curve. It might still be good now but in the long run
as you apply pressure there will be a bent in the table. I've had that
with my banquet tables and table tennis tables have even less support.
Would be good for quilt basting though. You can take a long quilting
ruler and set it perpendicular to the table and you will see if it lays
flat or not. Check everywhere...specially the middle.